Abaixo está uma instrução que descreve uma tarefa de geração de SQL, combinada com uma entrada que fornece mais contexto sobre os esquemas de tabela disponíveis. Escreva o código SQL que responda adequadamente à solicitação
 ###Instrução: Qual é o papel da aeronave que possui um registro de s5-hpg s5-hpc?
 ###Tabelas: CREATE TABLE nielsen_ratings (nielsen_ratings_id AUTO_INCREMENT PRIMARY KEY, Season VARCHAR, Timeslot Times listed are Eastern time VARCHAR, Season premiere VARCHAR, Season finale VARCHAR, TV season VARCHAR, Ranking INT, Viewers (in millions of households) VARCHAR) CREATE TABLE helicopters (helicopters_id AUTO_INCREMENT PRIMARY KEY, Aircraft VARCHAR, Origin VARCHAR, Role VARCHAR, Registration VARCHAR, Number VARCHAR) CREATE TABLE spaceflight_by_year (spaceflight_by_year_id AUTO_INCREMENT PRIMARY KEY, Rocket launch VARCHAR, Launch Date VARCHAR, Mission VARCHAR, Institutional authority VARCHAR, Launch Site VARCHAR, Outcomes VARCHAR, Derivatives VARCHAR) CREATE TABLE u.s._unmanned_soft_landings_1966–1968 (u.s._unmanned_soft_landings_1966–1968_id AUTO_INCREMENT PRIMARY KEY, U.S. mission VARCHAR, Mass (kg) INT, Booster VARCHAR, Launched VARCHAR, Mission goal VARCHAR, Landing zone VARCHAR, Lat / Lon VARCHAR) CREATE TABLE season_1_1994–95 (season_1_1994–95_id AUTO_INCREMENT PRIMARY KEY, No. in series VARCHAR, Title VARCHAR, Directed by VARCHAR, Written by VARCHAR, Original air date VARCHAR, Production code VARCHAR)  
SELECT Role FROM helicopters WHERE Registration = s5-hpg s5-hpc